Improvement in ball-and-socket-joint fastenings



- 2Sheets--Sheet1. W. F. T'ALLMAN &- l. H. MANDEVILLE. Ball and Socket-Joint Fastening. 59 471 Patented Feb.2,1875

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WILLIAM F. TALLMAN, OF MINEVILLE, NEW YORK, AND JAMES H.

' MANDEVILLE, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPRO VEMENT IN BALL-AND-SOCKET-JOINT FASTENING-1S.

Specification formingpart of Letters PatentN0..159,4l7l, dated February 2, 1875; application filed I January 23, 1875.

To all whom it may concern: 7

Be it known that we, WILLIAM F. TALLMAN, of Mineville, in the county of Essex, in the State of New York, and JAMES H. MANDEVILLE, of the city of Washington, in the District of O0- lumbia, have invented a new and useful Improvement upon the Ball-and-Socket-Joint Fastening for Adjustable Tripods, and for other purposes, of which the following specification, with a drawing made as a part hereof, is a full, clear, and exact description.

This invention is specially adapted to adj ustable tripods for rock-drills; but it obviously may be applied withmarked utility to theodolites, or to any other instrument intended to be worked upon an angle. V

This invention (shown particularly in Figs. I, III, IV, and VI) consists, first, in slitting the removable and adjusting cup upon its bowl or bottom, so as to gain an increased binding power by the yielding and spreading and wedging of the cup into the socket when the ball is bound upon it 5 second, in the combination of a yielding and spreading cup with a lower fixed socket, or with a socket made to turn upon an axis for adjusting purposes by means of a common friction-ball and its binding-nut.

In the drawings attached hereto, Figure I, Sheet 1, is a sectional elevation of our invention, the improvement upon a ball-and-socketjoint fastening, and its adaptability to rockdrills for adjusting the drill to work at any angle. Fig. II is a plan view of the rock-drill guide. Fig. III is a view of the removable cup inverted, with slots and divisions cut into its bottom, so as to allow of a yielding and spreading of the cup. Fig. IV is an isometrical view of the hub of a tripod. Figs. V and VI, Sheet 2, show a plan and elevation of one leg of a tripod to represent the application of the invention, and Fig. VII is an elevation of the friction-ball and its adjusting-nut.

In the drawing, A represents a grooved shell in'which a rock-drill is worked, either by compressed air or steam. The shell is mounted on a tripod having legs adjustable at b, Fig. V. The hub or body I) has an axis, 0, cast as a part of it, preferably, or so fastened otherwise that it cannot turn in the hub. On each end of the hub are spherical cavities s, to receive spherical counterpart projections S S, which constitute a part of the legs, or the upper arm of the legs E F of the tripod. The shiftingleg H is attached to the axis 0 by the circular arms a a which form a yoke. The arm a is made a part of the leg H, but the arm a is a separate piece, being attached, by bolts 5 6, to the leg, or by any other equivalent means, such as a ring and wedge, as used to fasten a scythe to its snath. In setting up the tripod the legs E F are put onto the axis 0 first, and then the leg H in sections. The sections are then bolted together and the binding-nuts w w screwed onto the axis.

This invention is employed to adjust a rockdrill to work at any angle. A ball-and-socket joint is too old and common to require any description beyond a naming of its parts. The friction-ball O is made solid to a square bolt. This bolt has a screw-thread on its end opposite the friction-ball, whereon is placed the washer n and binding-nut m, Fig. VII. On top of the hub D is a spherical socket, 01, into which sets the removable cup B. The cup and socket, as shown at u, are turned at different angles. The cup B is cut or slit upon its bottom, and, as shown at 1 2 3 4 in Fig. III, it is out at right angles nearly one-half the depth of the cup. This divides the convex surface of the cup equally into quarter-sections. The removable cup is placed in the socket under the friction-ball. The concave surface of this spreading cup is a socket for the friction-ball, but its convex surface is a friction-ball in the socket. Now, when the binding-nut m is ti ghtened upon the bolt of the friction-ball, of course drawing both ball and cup downward, the slitted cup yields and spreads, filling the entire space of the socket the cup is wedged into the socket.

In practice, except for the most accurate mathematical instruments, it is not necessary to turn the cup and socket, one fitting within the other so accurately that the whole surface of one will exactly fit the whole surface of the other, and remote from a manufactory it would be very difficult so to turn them.

The removable cup could be made of wood in quite an unfinished manner, and, being slitted, it would serve perfectly the use for which it is intended.

Now, the spreading of the slitted cup, when bound between the friction-ball and the lower socket, enables the friction-surface to be utilized to its full extent.

The removable cup, if desired, can be used upon the axis of the tripod.

with the yielding and wedging-cup B and the socket d, when constructed substantially as herein shown and described.

In witness whereof we hereunto subscribe our names and afiix our seals, each in the presence of two attesting witnesses, the said WIL- LIAM F. TALLMAN, at Mineville, Essex county, New York, the 14th day of January, 1875, and the said JAMES H. MANDEVILLE, at the city of Washington, the 16th day of January, 1875.

WILLIAM FOVEL TALLMAN. L. s] JAMES H. MANDEVILLE. L. s.)

Witnesses to the signature of W. F. TALL- MAN A. B. WALDO, RoBT. I. GHAHOON.

Witnesses to the signature of J. H. MANDE- VILLE:

J. O. MORGAN, LoUIs BAGG-ER. 

